Abstract
The first herpetological information on the Sierra de Famatina massif (6250 m), La Rioja Province, Argentina, includes two new species of Phymaturus and Liolaemus living at altitudes from 3600 to 4200 m. Taxonomic and ecological relationships between these isolated tropidurine iguanids and nearby related species from the Cordilleran highlands are discussed. A montane species-group comprising Uolaemus ruibali, L. duellmani and L. famatinae sp. nov. is suggested by morphological affinities. * * *
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